Machine for mixing concrete.



No. 675,035. Patented May 28, I90l.

C. T. DRAKE. MACHINE FOR MIXING CONCRETE.

(Application'filed July 18, 1899..)

(No Model.)

\mugov, ZZYZQMA Wkmesses.

: uonqls PCYERS no moYoLrma. WASNINDYON o c JITF' STATES FFICE.

CHESTER T. DRAKE, OF CHICAGO, ILLINOIS.

MACHINE FOR MIXING CONCRETE.

SPECIFICATION forming part of Letters Patent No. 675,035, dated May 28,1901.

Application filed July 18, 1899.

To (LZZ whom, it may concern:

3e it known that I, CHESTER T. DRAKE, a citizen of the United States,residing in Ohicago, in the county of (look and State of Illinois, haveinvented a new and useful Improvement in Machines for Mixing Concrete,of which the following is a specification.

My invention relates to machines having one or more shafts armed withknife-bars which extend from the shaft radially and as the shaft isrevolved pass through the concrete material beneath the shaft, so as tomix the ingredients.

The nature of my invention consists in part in the arrangement upon arotating shaft of knives of peculiar shapes adapted to thoroughly andrapidly mix the several ingredients of the concrete.

It consists also in part in the arrangement of a series of hoppersprovided with spiral conveyers, which may be revolved at any speeddesired, so as to feed the ingredients which are thrown into theseparate hoppers respectively as fast as may be desired and so as tovary the proportion of the sand,

cement, and stone entering into the mixinghopper.

In the drawings, Figure 1 is a side elevation of my machine. Fig. 2 is aplan view of the machine as seen from above it. Fig. 3 is an endelevation showing the driving-wheels at the feed end of the machine.Fig. 4 is a view of one of the shovel-arms of the mixing-shaft, and Fig.5 is a view of one of the knife-arms of the mixing-shaft.

A represents the strong wooden frame and bed of the machine.

B represents the platemetal hopper, in which the materials are mixed bythe revolving arms H I, which are secured in strong metal hubs which fitupon the square shafts D.

O, C, and C are plate-metal hoppers, which are provided, respectively,with the spiral conveyers J J J upon the shafts F F, F respectively, andthese shafts arejournaled, so that the lower side of each spiralconveyer will reach to the interior bottom surface of its hopper andcrowd the material (1). 6., stone shoveled into hopper C, sand shoveledinto hopper C and cement shoveled into hopper G) toward and out of thedischarge end of its Serial No. 724,238. (No model.)

hopper, so that the ingredient materials will fall in to themixing-hopper beneath and beyond the receiving-hoppers.

The square shafts D have journals turned upon them to fit the boxes 6and are provided with twin gears E, so that their motion shall beuniform, and another gearwheel upon one of the shafts receives the powerwhich drives them.

Strong metal knife-arms H and shovel-arms I are secured in the hubs,which fit upon the shafts D and revolve with the shafts and stirtogether the separate materials within the mixing-hopper. Thedisposition of the knife? arms H and shovel-arms I upon the respectiveshafts is such that as they are rotated the mixing-blades on one of theshafts will work in the spaces next adjacent the respective sides of theshovel-blades. The shovel-arms present their wide fiat surface to thematerial as they revolve and scoop up the material, carry it upward, andallow it to fall to the bottom turned upside down, so as to morethoroughly intermix the ingredients. The knife-arms present their narrowedges to the material as they revolve, and all the arms II I standaslant or obliquely on shafts D as much as may be desired, so as tocrowd the material toward the discharge end of the mixing-hopper as theyrevolve, and all should extend downward to the inner bottom surface ofthe mixing-hopper.

The shafts D have sprocket-wheels (31 upon them, and the spiral-conveyorshafts have wheels fff, respectively, of any size desired,

and sprocket-chains communicate powerfrom wheels d to wheels f, so as todrive the spiral conveyers at any desired rate of speed relative to eachother, and thus regulate the proportions of the ingredients enteringinto the mass of concrete or vary said proportions by changing thesprocket-wheels.

I claim as my invention- 1. In a concretemixer, the combination with acasing, of a plurality of shafts therein, means for operating theshafts, shovel-blades on one of said shafts, and mixer-blades on theopposite shaft arranged and adapted to work in the spaces next adjacentthe respective sides of the shovel-blades substantially as described.

2. In a concretemixer, the combination with a casing,ofparallel shaftsmounted therein, means for rotating the shafts, shovel and mixer bladesmounted on the respective shafts and so disposed that in operation theshovel-blades will pass between a pair of mixer-blades, substantially asdescribed.

3. In combination with a concrete-mixer, of a supporting-framework,hoppers therein at substantially the same level and adjacent said mixer,and chutes G at opposite points on the framework for directing thematerial discharged from the outer hoppers toward the center hopper,substantially as described.

4. In a concrete-mixer, the combination with a mixing-chamber, ofparallel shafts therein, mixer-blades on the shafts, a series of hoppersadjacent the miXing-chamber,and means for directing material from all ofthe CHESTER T. DRAKE.

Witnesses:

OSCAR PETERSON, JOSEPH M. WEBER.

